Are you referring to the state of Washington or DC? I am pretty sure Washington state has no state tax. They just have high sales tax.
Both Texas and WA state have no state income tax. They have higher than average sales and property tax, these are still state tax which are deductible under SALT.
The point is they have a similar state tax system, but one is a blue state, the other is red. They both have in common a relatively low overall state tax compared to CA/NY.